Question

the effect of temperature on the respiration rate of heterotrophic bacteria in a shallow, slow - moving freshwater stream was investigated by performing the following experiment. the water temperature of the stream was monitored over a continuous 24 - hour period (starting time = 0 hrs). the respiration rates of bacteria living in the stream were determined at 6 hours and 9 hours. the results are presented below. based on the information provided, what was the change (in °c) in water temperature associated with the change in respiration rate shown in figure 2? give your answer to one decimal place.
figure 1. water temperature
figure 2. respiration rate

Explanation:

Step1: Find water - temperature at 6 hours

From Figure 1, when time = 6 hours, the water temperature is approximately 7°C.

Step2: Find water - temperature at 9 hours

From Figure 1, when time = 9 hours, the water temperature is approximately 13°C.

Step3: Calculate the change in water - temperature

The change in water - temperature $\Delta T=T_2 - T_1$, where $T_2$ is the temperature at 9 hours and $T_1$ is the temperature at 6 hours. So, $\Delta T=13 - 7 = 6.0$°C.

Answer:

6.0